Spray gun



FIG. 1 is a perspective view of the spray gun showing our new design;

FIG. 2 is a side elevation view thereof opposite to the side shown inFIG. 1;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevation view thereof; and

FIG. 5 is a rear elevation view thereof.

The ornamental design for a spray gun, as shown.